The mobile phone and the laptop are compatible becuase they both have USB drives, can communicate via WiFi and have Bluetooth technology.

Many digital devices are converging: performing functions that were originally peformed by different devices, eg: phone with a camera.

A device that can perform several functions is called a multifunctional device.

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Bandwidth and latency

Bandwidth and latency

Bandwidth: measure of capacity

number of bits that can go through the network connection in 1 second.

measured in BPS ( bits per second )

Latency: measurment of delay

the time in milliseconds between a bit leaving one device and arriving at the other

User experience

for streaming videos you need a high bandwidth, otherwise your video will kepp pausing and your computer waits for more bits to arrive

to get quick google results you need a low latency, information if travelling in both directions so it needs to arrive quickly.

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Peer to Peer networks

Peer to peer networks

when digital devices communicate wirelessly with each other directly without the need for a transmitter between them.

Devices used to communicate with each other through a transmitter : a wireless access point when using WiFi and a mobile phone mast when using mobile broadband.

WiFi Direct :new technology allows devices to connect directly using WiFi without the need for a wireless access point.

allows users to set up peer to peer networks

also allows the device to use an access point for normal WiFi use.

Bluetooth

allows devices to communicate automatically when within range

can connect up to 8 devices at the same time

low power so does not interfere with other devices

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Physical security risks

physical security risks

Physical accses to data

Data is at risk becuase people can physically access your computer and steal it. To prevent this you can press the lock button when you leave your computer unattended so it requires a password to be entered to use it again.

Preventing theft of equipment

Chains and lock can be used to fix the equipment to the table also using locks and bolts on doors. Radio frequency Identification chips can be used in lables attached to items, then a scanner can read the chip and identify the product.